Thermal

Shutdown

Current

Limit

UVLO

Bandgap

IN

EN

OUT

LOGIC

GND

TLV702-Q1 Series

11

TLV702-Q1

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SLVSC35D – AUGUST 2013 – REVISED JULY 2019

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7 Detailed Description

7.1 Overview

The TLV702-Q1 series of low-dropout (LDO) linear regulators are low quiescent current devices with excellent

line and load transient performance. These LDOs are designed for power-sensitive applications. A precision

bandgap and error amplifier provides overall 2% accuracy. Low output noise, very high power-supply rejection

ratio (PSRR), and low dropout voltage make this series of devices ideal for most battery-operated handheld

equipment. All device versions have integrated thermal shutdown, current limit, and undervoltage lockout (UVLO)

protections.

7.2 Functional Block Diagrams

Figure 23. TLV702-Q1 Block Diagram

7.3 Feature Description

7.3.1 Internal Current Limit

The TLV702-Q1 internal current limit protection helps to protect the regulator during fault conditions. During

current limit operation, the output sources a fixed amount of current that is largely independent of the output

voltage. In such a case, the output voltage is not regulated, and is VOUT = ICL × RLOAD. The PMOS pass transistor

dissipates (VIN – VOUT) × ICL until thermal shutdown is triggered and the device turns off. As the device cools, the

device is turned on by the internal thermal shutdown circuit. If the fault condition continues, the device cycles

between current limit operation and thermal shutdown. See Thermal Consideration for more details.

The PMOS pass element in the TLV702-Q1 has a built-in body diode that conducts current when the voltage at

the OUT pin exceeds the voltage at IN. This current is not limited; if extended reverse-voltage operation is

anticipated, externally limit the output current to 5% of the rated IOUT specification.